Sakcee wrote:
> python provides a great way of dynamically creating fuctions calls and
> class names from string
>
> a function/class name can be stored as string and called/initilzed
>
> e.g
>
> def foo(a,b):
> return a+b
>
> def blah(c,d):
> return c*d
>
>
> list = ["foo", "blah"]
>
> for func in list:
> print func(2,4)
>
> or similar items
No, that doesn't work. To convert a string to a function name you have to
look it up in a suitable namespace, or store a list of functions instead of
a list of strings. So something like this would work:
lst = [foo, blah]
for func in lst:
print func(2,4)
>
>
> what is the way if the names of functions are some modification e.g
>
> def Newfoo(a,b):
> return a+b
>
> def Newblah(c,d):
> return c*d
>
> list = ["foo", "blah"]
>
> for func in list:
> print "New"+func(2,4)
>
> or define a variable
>
> "New"+list[0] = "First Funciton"
>
>
> I think , print "New"+func(2,4) and "New"+list[0] = "First
> Funciton"
>
> will not work, either eval or exec should be used
> is it correct way, is there a simple way, is this techniqe has a name?
>
One common way is to group the functions you want callable together in a
class and then use getattr to access them.
class Commands:
def Newfoo(self, a,b):
return a+b
def Newblah(self, c,d):
return c*d
def call(self, fname, *args. **kw):
fn = getattr(self, "New"+fname)
return fn(*args, **kw)
cmds = Commands()
lst = ["foo", "blah"]
for func in lst:
print cmds.call(func, 2, 4)
--
http://mail.python.org/mailman/listinfo/python-list
